Cobble-stone and grout pavement



IOGJCOMPOSITIONS, 5

COATING 0R PLASTIC. CI'OSS Reference i j v 7 7 (No Model.)

JYMURPHYJ OO'BBLE STONE AND GROUT PAVEMENT. No. 258,460, Patented May 23. 1882.-

' WITNESSES N. mun MW. Wm IC- 4 UNITED STATES To all whom it may concern:

Be it known that I, JOHN MURPHY, of Golumbus, in the county Franklin and State of Ohio, have invented a new and useful Improve- D 5 ment in Cobble-Stone and Grout Pavements,

of which the following is a full, clear, and exact description, reference being had to the annexed drawing, forming part of this specification.

1o The-object of my invention is to provide a cheap pavement which will harden and solidify on exposure to moisture, and thus secure durability and that firmness of structure by which I 5 ing over stone pavements shall be prevented.

The'drawing represents'a section of roadbed and pavement constructed according to .my process.

. My pavement is constructed in the following 2o manger: When theroad-bedAhasben graded 1 I spre rave] theronit a depth of about four inches a e va..el with a. heavy M roller. I then sprea bout two inches of sand glredients ulverized sla thirty per cent.; 30 0 can river sand thirty per cent.' rich lime a twenty per cent.; silica six" per cent; Portland cement six per cent; ore-dust eight per v cent. Upon the grout I spread screenings to a depth of one or two inches more in order to 5 hold the stones in position under the rammer i and to make the pavement firm untilthe grout has time to harden. Before laying acourseof it/W PATENT OFFICE.

stone will become saturated with water, and

the noise commonly produced by vehicles pass- 4 proves with age and renders f and )ulv rizedsla updn the gravel, and upon 25 thishay the stones B with the small ends with a grout composed of the following ingrout the pavement or bed is always sprink- JOHN MURPHY, on COLUMBUS, OHIQ. COB BLE- STONE .ANDGROUT PAVEMENT.

SPECIFICATION forming part of Letters Patent No. 258,460, dated May 23,1882.

' ApplicationfiledFebr-uaryll,1882. (NomodeL) led with water'to furnish the required amount of moisture for making a mortar or cement. When the screenings are spread and the work Y is properly rammed the pavement is again sprinkled with water, and the interstices be tween the stones are filled with another layer of grout to a level with the surface of the pavenient. Alight coat of sand is then spread over the surface of the pavement-,and on thefollow ing day the pavement will beready for use.

. With this construction the slag under the will=harden in course of time, like mortar,while the grout will form a more durable filling than the ordinary asphaltum pitch or coal-tar. The latter disintegrates and crumbles, and in a few years will become useless, while the groutim-' the pavement a solid stony mass. T

I am aware that most of the above-named 'ingredients havebeenvariouslycombined with pitch or asphaltum informing paving com- 6) positions, and I therfore do not tlaim them, broadly. Having thus described my invention, what 7 I claim, and desire to secure by Letters Patent,

A pavement consisting of cobble-stonesand a grout composed of p u lv erized slag, sand, lime, silica, Portland cementfan ore-dust, substantially as described, whereby the use of pitch or asphaltum may be dispensed with, as 70 set forth. 1 JOHN MURPHY.

Witnesses:

' J, D. SULLIVAN, ,J. C. 'Rronnnns.

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